Model Comparison

Claude Sonnet 4.5 vs GPT-4 Turbo

Claude Sonnet 4.5 significantly outperforms across most benchmarks. Claude Sonnet 4.5 is 2.5x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Sonnet 4.5 outperforms in 1 benchmarks (GPQA), while GPT-4 Turbo is better at 0 benchmarks.

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Wed Apr 22 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude Sonnet 4.5 costs less

For input processing, Claude Sonnet 4.5 ($3.00/1M tokens) is 3.3x cheaper than GPT-4 Turbo ($10.00/1M tokens).

For output processing, Claude Sonnet 4.5 ($15.00/1M tokens) is 2.0x cheaper than GPT-4 Turbo ($30.00/1M tokens).

In conclusion, GPT-4 Turbo is more expensive than Claude Sonnet 4.5.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed Apr 22 2026 • llm-stats.com
Anthropic
Claude Sonnet 4.5
Input tokens$3.00
Output tokens$15.00
Best providerAnthropic
OpenAI
GPT-4 Turbo
Input tokens$10.00
Output tokens$30.00
Best providerAzure
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Context Window

Maximum input and output token capacity

Claude Sonnet 4.5 accepts 200,000 input tokens compared to GPT-4 Turbo's 128,000 tokens. Claude Sonnet 4.5 can generate longer responses up to 64,000 tokens, while GPT-4 Turbo is limited to 4,096 tokens.

Anthropic
Claude Sonnet 4.5
Input200,000 tokens
Output64,000 tokens
OpenAI
GPT-4 Turbo
Input128,000 tokens
Output4,096 tokens
Wed Apr 22 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Sonnet 4.5 supports multimodal inputs, whereas GPT-4 Turbo does not.

Claude Sonnet 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Sonnet 4.5

Text
Images
Audio
Video

GPT-4 Turbo

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Sonnet 4.5

Proprietary

Closed source

GPT-4 Turbo

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.5 was released on 2025-09-29, while GPT-4 Turbo was released on 2024-04-09.

Claude Sonnet 4.5 is 18 months newer than GPT-4 Turbo.

Claude Sonnet 4.5

Sep 29, 2025

6 months ago

1.5yr newer
GPT-4 Turbo

Apr 9, 2024

2.0 years ago

Knowledge Cutoff

When training data ends

Claude Sonnet 4.5 has a knowledge cutoff of 2025-01-31, while GPT-4 Turbo has a cutoff of 2023-12-31.

Claude Sonnet 4.5 has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to GPT-4 Turbo (2023-12-31).

Claude Sonnet 4.5

Jan 2025

1.1 yr newer
GPT-4 Turbo

Dec 2023

Provider Availability

Claude Sonnet 4.5 is available from Anthropic. GPT-4 Turbo is available from Azure, OpenAI.

Claude Sonnet 4.5

anthropic logo
Anthropic
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

GPT-4 Turbo

azure logo
Azure
Input Price:Input: $10.00/1MOutput Price:Output: $30.00/1M
openai logo
OpenAI
Input Price:Input: $10.00/1MOutput Price:Output: $30.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Less expensive input tokens
Less expensive output tokens
Higher GPQA score (83.4% vs 48.0%)
OpenAI

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.5
OpenAI
GPT-4 Turbo

FAQ

Common questions about Claude Sonnet 4.5 vs GPT-4 Turbo

Claude Sonnet 4.5 significantly outperforms across most benchmarks. Claude Sonnet 4.5 is made by Anthropic and GPT-4 Turbo is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Claude Sonnet 4.5 scores MMMLU: 89.1%, AIME 2025: 87.0%, TAU-bench Retail: 86.2%, GPQA: 83.4%, MMMUval: 77.8%. GPT-4 Turbo scores MGSM: 88.5%, HumanEval: 87.1%, MMLU: 86.5%, DROP: 86.0%, MATH: 72.6%.
Claude Sonnet 4.5 is 3.3x cheaper for input tokens. Claude Sonnet 4.5 costs $3.00/M input and $15.00/M output via anthropic. GPT-4 Turbo costs $10.00/M input and $30.00/M output via azure.
Claude Sonnet 4.5 supports 200K tokens and GPT-4 Turbo supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (200K vs 128K), input pricing ($3.00 vs $10.00/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.
Claude Sonnet 4.5 is developed by Anthropic and GPT-4 Turbo is developed by OpenAI.